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public class TestSqlDatabase{
private static final String DATABASE_PATH = "/data/data/your.package.name/databases"; //此处不要改动，这个为数据库在手机上的物理地址
private static final int DATABASE_VERSION = 0;
private static final String DATABASE_NAME = "test.db"; //此处为数据库名称
private static String outFileName = DATABASE_PATH + "/" + DATABASE_NAME;
private Context context;
private SQLiteDatabase database;
public TestSqlDatabase(Context context) {
this.context = context;
File file = new File(outFileName);
if (file.exists()) {
database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
if (database.getVersion() != DATABASE_VERSION) {
database.close();
file.delete();
}
}
try {
buildDatabase();
} catch (Exception e) {
e.printStackTrace();
}
}
private void buildDatabase() throws Exception{
InputStream myInput = context.getResources().openRawResource(R.raw.test);
File file = new File(outFileName);
File dir = new File(DATABASE_PATH);
if (!dir.exists()) {
if (!dir.mkdir()) {
throw new Exception("创建失败");
}
}
if (!file.exists()) {
try {
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.close();
myInput.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* 查找
* @return
*/
public Cursor select() {
database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
String sql = "select * from note_table";
Cursor cursor = database.rawQuery(sql, null);
return cursor;
}
/**
* 插入
* @param word
* @param note
* @return
*/
public long insert(String word, String note) {
database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
ContentValues cv = new ContentValues();
cv.put("word", word);
cv.put("note", note);
long result = database.insert("note_table", null, cv);
return result;
}
/**
* 更新
* @param word
* @param note
* @return
*/
private int update(String word, String note) { //参数 word 为修改条件 note为修改内容
database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
ContentValues cv = new ContentValues();
cv.put("note", note);
int result = database.update("note_table", cv, "word=?", new String[]{word});
return result;
}
/**
* 删除
* @param word
*/
public int deleteNote(String word) {
database = SQLiteDatabase.openOrCreateDatabase(outFileName, null);
int result = database.delete("note_table", "word=?", new String[]{word});
return result;
}
public void close() {
database.close();
}
}
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